Fix numerous Azure property issues (#511)

* Avoid crashing if azure edition is System.

* Add new Azure-specific options to the prototype and return through the service calls

* Send azure properties over database info request

* IsCloud should include Azure SQL DW
- Fixed references to this feature flag
- Updated edition handling to include ManagedInstance and removed AzureV1 check since it's never used and it's been retired.

test/Microsoft.SqlTools.ServiceLayer.IntegrationTests/Connection/ReliableConnectionTests.cs

@@ -317,7 +317,6 @@ namespace Microsoft.SqlTools.ServiceLayer.IntegrationTests.Connection
                 Assert.True(serverInfo.ServerEdition == serverInfo2.ServerEdition);
                 Assert.True(serverInfo.IsCloud == serverInfo2.IsCloud);
                 Assert.True(serverInfo.AzureVersion == serverInfo2.AzureVersion);
-                Assert.True(serverInfo.IsAzureV1 == serverInfo2.IsAzureV1);
             }
         }